ET joined Pierce Brosnan and more stars from 'Percy Jackson & the Olympians: The Lightning Thief' as they premiered their dazzling new fantasy flick in NYC on Thursday night.

Pierce tells ET his kids were instrumental in convincing him to join 'Percy Jackson': "They said, 'Dad, you gotta do it, you gotta do it!'"

The star says that when he screened the film for his whole family a couple of weeks ago, they loved it. "My eight-year-old said, 'It's the best film you've made, Dad.' … That was like getting an Oscar."

"This movie's just a ride from beginning to end. It's just movie magic and a lot of fun," adds Percy himself, Logan Lerman.

In 'Percy Jackson & the Olympians: The Lightning Thief,' which hits theaters on Feb. 12, Percy Jackson (Lerman) finds himself accused by Zeus, the king of the Greek gods, of stealing his lightning bolt. So, our young hero sets out on a quest to find the real thief, encountering Pierce's half-man half-horse character Chiron along the way!

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